If you want to register a domain name to make certain that no one else will take it, but you haven't developed the website for it yet, you may park it. It's a feature that registrar companies provide if a domain isn't linked to any web or e-mail hosting service. By doing this, you can protect a brand name, for example, and you will own the domain address in question even though it won't load any content. If you want, you can pick some default template that the registrar provides, like For Sale or Under Construction, you can also forward the domain name to an alternative web address. The second option is extremely helpful in case you own a number of domain names, but you want all of them to open the same site. As an example, you can register domain.net and domain.org, then park them and forward them to domain.com. In this example, you will need hosting for the third domain address only and the traffic to the other ones will be redirected to it.